In answer to your question, there are no extra points given for booking single.
More than 300 days at sea so far with many more to come. (Actually more - one of these days I'll count them properly.)
January 12/13 - Celebrity Reflection
41 cruises - too many to list however cruiselines are in no particular order:
and some unknown tub
Yes, I'm a Royal Chump and proud of it.